Crossword Genius

Son available to provide drink (6)

Ross

I believe the answer is:

shandy

I'm a little stuck... Click here to teach me more about this clue!

'drink' is the definition.
(I know that shandy is a type of drink)

'son available' is the wordplay.
I cannot really understand how this works, but
'son' could be 's' (genealogical abbreviation for son) and 's' is found within the answer.
The remaining letters 'handy' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'to provide' is the link.

Can you help me to learn more?

(Other definitions for shandy that I've seen before include "Lemonade-beer drink" , "Beer-lemonade mix" , "Weakly-alcoholic drink" , "Beer/lemonade mixture" , "mixed drink" .)

I've seen this clue in The Times.
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